阳离子交换法分离147Pm与Nd的条件研究OA

Reactor irradiation of enriched 146Nd targets represents an important route for the production of 147Pm,where the major challenge lies in the efficient separation of trace 147Pm from a bulk Nd matrix.To establish a feasible separation process of 147Pm/Nd,the adsorption and separation behaviors of Nd and 147Pm on AG 50W×8 strong-acid cation-exchange resin were systematically investigated.Samarium was employed as a chemical surrogate for 147Pm during the optimization of process parameters.Batch adsorption results demonstrated that,in dilute hydrochloric acid media(0.000 1-0.1 mol/L HCl),Nd and 147Pm reached adsorption equilibrium within 10 min.The adsorption kinetics followed a pseudo-second-order model,and the adsorption isotherms were well described by the Langmuir model.The maximum adsorption capacities of the resin for Nd(Ⅲ)and Sm(Ⅲ)were determined to be 236.9 mg/g和 210.9 mg/g,respectively,from which the adsorption capacity of 147Pm can be reasonably inferred to lie between those of Nd and Sm.Based on the batch adsorption results,systematic column separation studies were carried out using Sm as a surrogate for 147Pm.The optimal chromatographic conditions were determined to be 0.4 mol/L α-hydroxyisobutyric acid(α-HIBA)as the eluent at pH 4.1,a flow rate of 1.0 BV/h,and a temperature of 75℃.Under these conditions,separation experiments using 147Pm as a tracer demonstrated that 147Pm was preferentially eluted prior to Nd,achieving a resolution of 1.21 and a recovery yield exceeding 88.1%.This study establishes a cation-exchange chromatographic process coupled with complexing elution for the separation of 147Pm from Nd,providing a practical experimental basis for the purification of 147Pm from irradiated 146Nd targets.